var request = null;
	
function createRequest() {			
	try {
		request = new XMLHttpRequest();
	}
	
	catch (trymicrosoft) {
		try {
			request = new ActiveXObject("Msxml2.XMLHTTP");
		}
	
		catch (othermicrosoft) {
			try {
				request = new ActiveXObject("Microsoft.XMLHTTP");
			}
			
			catch (failed) {
				request = null;
			}
		}
	}
	
	if (request == null) {
		alert("Error creating request object!");
	}
}